Running chain hoists, similar to other lifting equipment, may encounter various faults during operation. Below is an analysis of common faults and corresponding improvement suggestions:

Common Fault Analysis

Engine/Motor Power Reduction

Fault Phenomenon: The hoist's lifting capacity decreases, and the lifting speed slows down.

Possible Causes:

The engine/motor output power is significantly lower than the rated power.

The fuel filter is clogged, or there are air leaks in the fuel line.

The fuel pump components (such as plungers, injectors, and outlet valves) are severely worn.

The air filter is blocked, or the turbocharger is damaged.

The engine overheats, causing the oil viscosity to decrease and cylinder wall sealing to deteriorate.

Reduced Working Speed

Fault Phenomenon: The hoist's operation speed becomes slower over time.

Possible Causes:

Wear and tear of various components in the hoist, leading to reduced engine power and internal leakage in the hydraulic system.

Internal leakage in the hydraulic system causes energy loss and generates heat, increasing the system temperature and reducing the viscosity of hydraulic oil and engine oil.

Weak Lifting Capacity

Fault Phenomenon: The hoist struggles to lift loads, and the engine speed drops sharply under heavy loads.

Possible Causes:

The hydraulic displacement does not comply with constant power output.

The relief valve pressure cannot be adjusted, and the relief valve itself may be damaged.

Problems with the hydraulic pump's regulating system or components (such as the cylinder block, valve plate, and plungers).

Control System Failure

Fault Phenomenon: The hoist cannot be controlled normally, or the control is unresponsive.

Possible Causes:

Electrical system failures, such as blown fuses or short circuits.

Hydraulic system failures, such as abnormal pilot pressure or stuck servo control valves.

Mechanical transmission system failures, such as wear or damage to gears or chains.

Improvement Suggestions

Regular Maintenance and Inspection

Establish a regular maintenance schedule to inspect and replace worn or damaged components in a timely manner.

Pay special attention to the inspection of the engine/motor, hydraulic system, and control system to ensure their normal operation.

Clean and Replace Hydraulic Oil Regularly

Regularly clean and replace hydraulic oil to prevent contamination and deterioration, which can affect the performance of the hydraulic system.

Check the hydraulic oil level and quality regularly to ensure it meets the operating requirements.

Strengthen Operator Training

Provide comprehensive training for operators to familiarize them with the hoist's operation procedures, safety regulations, and maintenance knowledge.

Emphasize the importance of adhering to operating rules and avoiding overloading or improper operation.

Improve Safety Measures

Install and regularly check safety devices such as overload limiters, limit switches, and emergency stop buttons to ensure their reliability.

Set up warning signs and isolation zones in the working area to prevent unauthorized personnel from entering.

Optimize the Design and Selection of Components

When selecting hoist components, prioritize high-quality, durable products to reduce the failure rate and maintenance costs.

Optimize the design of the hoist structure to improve its stability and lifting efficiency.

Establish a Fault Emergency Response Mechanism

Formulate an emergency response plan for hoist faults to ensure that faults can be handled promptly and effectively when they occur.

Regularly organize emergency drills to improve the emergency response capabilities of operators and maintenance personnel.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment